diff --git a/bus-mapping/src/evm/opcodes.rs b/bus-mapping/src/evm/opcodes.rs
index afb9481328..ca538ef163 100644
--- a/bus-mapping/src/evm/opcodes.rs
+++ b/bus-mapping/src/evm/opcodes.rs
@@ -285,9 +285,6 @@ pub fn gen_associated_ops(
     state: &mut CircuitInputStateRef,
     geth_steps: &[GethExecStep],
 ) -> Result<Vec<ExecStep>, Error> {
-    let fn_gen_associated_ops = fn_gen_associated_ops(opcode_id);
-
-    // if no errors, continue as normal
     let memory_enabled = !geth_steps.iter().all(|s| s.memory.is_empty());
     if memory_enabled {
         let check_level = if *CHECK_MEM_STRICT { 2 } else { 0 }; // 0: no check, 1: check and log error and fix, 2: check and assert_eq
@@ -356,6 +353,7 @@ pub fn gen_associated_ops(
         }
     }
     // if no errors, continue as normal
+    let fn_gen_associated_ops = fn_gen_associated_ops(opcode_id);
     fn_gen_associated_ops(state, geth_steps)
 }
 
diff --git a/bus-mapping/src/evm/opcodes/error_invalid_opcode.rs b/bus-mapping/src/evm/opcodes/error_invalid_opcode.rs
index d73f6bfae4..5b6cd87ce3 100644
--- a/bus-mapping/src/evm/opcodes/error_invalid_opcode.rs
+++ b/bus-mapping/src/evm/opcodes/error_invalid_opcode.rs
@@ -1,4 +1,5 @@
 use crate::circuit_input_builder::{CircuitInputStateRef, ExecStep};
+use crate::error::ExecError;
 use crate::evm::Opcode;
 use crate::Error;
 use eth_types::GethExecStep;
@@ -13,13 +14,7 @@ impl Opcode for InvalidOpcode {
     ) -> Result<Vec<ExecStep>, Error> {
         let geth_step = &geth_steps[0];
         let mut exec_step = state.new_step(geth_step)?;
-
-        let next_step = if geth_steps.len() > 1 {
-            Some(&geth_steps[1])
-        } else {
-            None
-        };
-        exec_step.error = state.get_step_err(geth_step, next_step).unwrap();
+        exec_step.error = Some(ExecError::InvalidOpcode);
 
         state.gen_restore_context_ops(&mut exec_step, geth_steps)?;
         state.handle_return(geth_step)?;
diff --git a/zkevm-circuits/src/evm_circuit/execution/error_invalid_opcode.rs b/zkevm-circuits/src/evm_circuit/execution/error_invalid_opcode.rs
index eb41b6932d..7f2dff2a84 100644
--- a/zkevm-circuits/src/evm_circuit/execution/error_invalid_opcode.rs
+++ b/zkevm-circuits/src/evm_circuit/execution/error_invalid_opcode.rs
@@ -128,12 +128,9 @@ mod test {
     use crate::test_util::CircuitTestBuilder;
     use eth_types::bytecode::Bytecode;
     use eth_types::{bytecode, ToWord, Word};
-    use itertools::Itertools;
     use lazy_static::lazy_static;
     use mock::TestContext;
 
-    const TESTING_CALL_DATA_PAIRS: [(usize, usize); 2] = [(0x20, 0x00), (0x1010, 0xff)];
-
     lazy_static! {
         static ref TESTING_INVALID_CODES: [Vec<u8>; 6] = [
             // Single invalid opcode
@@ -156,11 +153,8 @@ mod test {
 
     #[test]
     fn invalid_opcode_internal() {
-        for ((call_data_offset, call_data_length), invalid_opcode) in TESTING_CALL_DATA_PAIRS
-            .iter()
-            .cartesian_product(TESTING_INVALID_CODES.iter())
-        {
-            test_internal_ok(*call_data_offset, *call_data_length, invalid_opcode);
+        for invalid_code in TESTING_INVALID_CODES.iter() {
+            test_internal_ok(0x20, 0x00, invalid_code);
         }
     }